MP1482 – 2A, 18V SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER
MP1482 Rev. 1.31 www.MonolithicPower.com 11
7/9/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
PCB LAYOUT GUIDE
PCB layout is very important to achieve stable
operation. It is highly recommended to duplicate
EVB layout for optimum performance.
If change is necessary, please follow these
guidelines and take Figure 4 for reference.
1) Keep the path of switching current short and
minimize the loop area formed by input cap,
high-side MOSFET and low-side MOSFET.
2) Bypass ceramic capacitors are suggested
to be put close to the Vin Pin.
3) Ensure all feedback connections are short
and direct. Place the feedback resistors
and compensation components as close to
the chip as possible.
4) Route SW away from sensitive analog
areas such as FB.
5) Connect IN, SW, and especially GND
respectively to a large copper area to cool
the chip to improve thermal performance
and long-term reliability.
INPUT
4.75V to 18V
OUTPUT
C1
C2
R4
C4
C3
D1
(optional)
C5
L1
R3
R2
R1
MP1482
BSIN
FB
SW
SS
GND COMP
EN
12
3
5
64
8
7
MP1482 Typical Application Circuit
L1
C4
R4
C3
R3
PGND
R1
R1
1
2
3
4
8
7
6
5FB
COMP
EN
BS
IN
SW
GND
SS
C5
D1
C2
PGND
C1
R2
SGND
Top Layer Bottom Layer
Figure 4—MP1482 Typical Application Circuit and PCB Layout Guide
